public class StringBufferDemo{
        public static void main(String [] args){
            StringBuffer buffer = new StringBuffer();
            buffer.append('S');
            buffer.append("tringBuffer");
            System.out.println(buffer.charAt(1));
            System.out.println(buffer.capacity());
            System.out.println(buffer.indexOf("tring"));
            System.out.println("buffer = " + buffer.toString());
        }
    }
